Question

我有一个相当简单的用例，但我不理解我收到的错误信息。

我正在使用请求和pyral模块，pyral（http://pyral.readthedocs.io/en/latest/interface.html#）实际上只是Rally的Restful api的包装器。我的目标是从Rally（CA产品）UserStory获取文件（附件）并将其存储到本地文件系统。

对于上下文，这是我的环境设置（对Rally进行身份验证并创建对象）。我显然删除了身份验证信息。

from pyral import Rally, rallyWorkset

options = [arg for arg in sys.argv[1:] if arg.startswith('--')]
args = [arg for arg in sys.argv[1:] if arg not in options]
server, user, password, apikey, workspace, project = rallyWorkset(options)
rally = Rally(server='rally1.rallydev.com', 
user='**********', password='***********', 
          apikey="**************",
          workspace='**************', project='**************',
          server_ping=False)

之后我只收到一个用户故事的响应对象（参见US845的查询），我这样做只是为了简化问题。

r = rally.get('UserStory', fetch = True, projectScopeDown=True, query = 'FormattedID = US845')

然后我使用内置迭代器从RallyRESTResponse对象中获取用户故事。

us = r.next()

从那里感觉我应该能够轻松使用接受工件（us）和文件名（附件名称）的getAttachment（）方法。我可以使用getAttachmentNames（us）返回附件名称列表。当我尝试像

这样的问题时，问题就出现了

attachment_names = rally.getAttachmentNames(us) #get attachments for this UserStory
attachment_file = rally.getAttachment(us, attachment_names[0]) #Try to get the first attachment

返回类似

的错误

Traceback (most recent call last):

File "<ipython-input-81-a4a342a59c5a>", line 1, in <module>
attachment_file = rally.getAttachment(us, attachment_names[0])

File "C:\Miniconda3\lib\site-packages\pyral\restapi.py", line 1700, in getAttachment
att.Content = base64.decodebytes(att_content.Content)  # maybe further txfm to Unicode ?

File "C:\Miniconda3\lib\base64.py", line 552, in decodebytes
_input_type_check(s)

File "C:\Miniconda3\lib\base64.py", line 520, in _input_type_check
raise TypeError(msg) from err

TypeError: expected bytes-like object, not str

如果我尝试使用

，我会收到类似的错误

test_obj = rally.getAttachments(us)

返回如下错误：

Traceback (most recent call last):

File "<ipython-input-82-06a8cd525177>", line 1, in <module>
rally.getAttachments(us)

File "C:\Miniconda3\lib\site-packages\pyral\restapi.py", line 1721, in getAttachments
attachments = [self.getAttachment(artifact, attachment_name) for attachment_name in attachment_names]

File "C:\Miniconda3\lib\site-packages\pyral\restapi.py", line 1721, in <listcomp>
attachments = [self.getAttachment(artifact, attachment_name) for attachment_name in attachment_names]

File "C:\Miniconda3\lib\site-packages\pyral\restapi.py", line 1700, in getAttachment
att.Content = base64.decodebytes(att_content.Content)  # maybe further txfm to Unicode ?

File "C:\Miniconda3\lib\base64.py", line 552, in decodebytes
_input_type_check(s)

File "C:\Miniconda3\lib\base64.py", line 520, in _input_type_check
raise TypeError(msg) from err

TypeError: expected bytes-like object, not str

似乎我从根本上误解了这种方法所需的参数？有没有人能够成功地做到这一点？对于它的价值，使用类似于上述工作流程的addAttachment（）方法没有问题。我已经尝试将bytes（）方法的文件名（字符串）转换为utf-8，但这没有帮助。

我也在pyral源代码中查看了这个例子，但是在尝试执行时我收到了完全相同的错误。

https://github.com/klehman-rally/pyral/blob/master/examples/get_attachments.py

Answer 1

看起来像restapi.py脚本中的问题 - base64库中没有decodebytes方法：

att.Content = base64.decodebytes(att_content.Content)

所有可用的方法描述于： RFC 3548: Base16, Base32, Base64 Data Encodings 因此，解决方法是在restapi.py中用base64.b64decode替换decodebytes。至少，它对我有用。

E.g。 Mac OS X上的位置：

/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pyral/restapi.py

Answer 2

由于getAttachments无法正常工作，因此我使用了以下代码来获取所有附件。它将在当前目录中创建一个同名文件。

import sys
import string
import base64
from pyral import rallyWorkset, Rally,RallyRESTResponse

rally = Rally(server, user=USER_NAME, password=PASSWORD, workspace=workspace, project=project)
criterion = 'FormattedID = US57844'
response = rally.get('HierarchicalRequirement',  query=criterion, order="FormattedID",pagesize=200, limit=400, projectScopeDown=True)

artifact = response.next()
context, augments = rally.contextHelper.identifyContext()
for att in artifact.Attachments:
    resp = rally._getResourceByOID(context, 'AttachmentContent', att.Content.oid, project=None)
    if resp.status_code not in [200, 201, 202]:
        break
    res = RallyRESTResponse(rally.session, context, "AttachmentContent.x", resp, "full", 1)
    if res.errors or res.resultCount != 1:
        print("breaking the for loop")
    att_content = res.next()
    cont = att_content.Content
    x = base64.b64decode(cont)
    output = open(att.Name, 'wb') 
    output.write(x)

PyRal getAttachment

2 个答案: